Event ID - 103

Event Id103
SourceESENT
Description<process name> (<PID>) The database engine stopped an instance (<instance>).
Event InformationAccording to Microsoft, this problem will be occurs if the server has run out of disk space. Following microsoft articles will give more information about this event.
Reference Links Insufficient Disk Space Generates False Upgrade Message

XADM: Error 0x451 When You Try to Mount Information Store After a Restore Operation

Recovering Transaction Logs on a Recovery Server That Does Not Have Access to the Production Active Directory

Multiple instances of "ESENT" in the Event Log - Windows XP SP2

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